Final answer:
B&L Soflens and Purevision Multifocal lenses are suited for those with presbyopia. Individuals with severe eye conditions might be poor candidates. LASIK can correct distance vision in presbyopia but does not restore accommodation, hence reading glasses might still be necessary.
Step-by-step explanation:
The ideal candidates for B&L Soflens and Purevision Multifocal lenses are individuals with presbyopia, which is an age-related condition where the eye exhibits a progressively diminished ability to focus on near objects. Meanwhile, poor candidates for these lenses would be individuals with certain eye conditions such as severe dry eyes, uncontrolled diabetes, or corneal abnormalities which might affect lens fitting and comfort.
Addressing the vision correction issues, if LASIK reshaping of the cornea is performed, there's typically a fixed percent uncertainty. Those with more significant vision corrections may have a poorer chance of achieving normal distant vision post-procedure due to the complexity of achieving a precise correction for higher degrees of myopia or hyperopia. Specifically, a myopic patient who undergoes a LASIK procedure to reduce their eye power by 9.00 diopters with a ±5.0% uncertainty would end up with a range of corrective needs from 8.55 to 9.45 diopters post-surgery.
In the case of presbyopia, LASIK can correct distant vision, but because LASIK does not address the loss of accommodation (the ability of the lens to change shape to focus), such individuals may still require reading glasses for near activities.